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Water Pump Relocation Adapter
#1344842 Mon Feb 03 2020 06:02 PM
Joined: Jan 2001
Posts: 5,007
Master Gabster

When installing a 1955-62 235 or 1955-63 261 full pressure engine in place of a 1937-54 216 or 235 engine, this conversion allows you to put the early high mount style pump on the later engine.

In the past modifying the 1955-62 water pump was done but required a press to force the hub further back on the shaft, then the hardened shaft required being cut off. Additionally a special pulley and fan was required. After all that the pump and fan still sat 3" lower than the 216 or early 235 pump and that could lead to overheating and possible fan hum.

By using my water pump relocation adapter plate with a 1941-54 water pump, the pump is put back in the stock location. Additionally if you need to replace the water pump in the future you can buy an over-the-counter pump and install it without modification.

Another advantage of using this relocation adapter plate and a stock pump is the stock lower radiator hose can be used. (The modified 1955-62 pump has a larger connection for the lower hose so a special hose is needed.)

Note: When installed in a 1939-40 Chev, the fan will be ¼” forward from stock but will fit fine.

Installation requires drilling and tapping two holes in the engine block.

The carbon in the cast iron keeps the drill bit cool, so no water or lubricant is necessary.
Low RPM drilling works best.

Note: I recommend using the harmonic balancer and water pump with the belt width you want from your original engine.

1941-52 ⅝" belt

1953-54 ⅜" belt (An acceptable substitution is to use a 1955-62 truck balancer. It is designed for a ½” belt and may be used with a ⅜" belt. This will allow the belt to run deeper in the groove and in effect will reduce the diameter to very near the correct size).

1937-40 must use one of the above

Caution: I do not recommend using the 1955-62 passenger balancer since the pulley is larger and may turn the fan too fast, leading to cracking. (to identify this balancer, the pulley is 6 3/4" OD X 5/8" outside to outside edge).

Adapter plate $40.00 plus $7.75 FR shipping.

You can PM me if you would like to buy this adapter directly from me, or have any additional questions.

Thanks, Dave

Picture of plate installed.

Attached Files
wpa 1b.JPG (106.05 KB, 115 downloads)
Last edited by Pre '68 Dave; Thu Feb 13 2020 04:26 PM. Reason: Removed ebay link

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Re: Water Pump Relocation Adapter
Pre '68 Dave #1344843 Mon Feb 03 2020 06:13 PM
Joined: Dec 2001
Posts: 15,184
...for those interested. I have used Dave's adapter plate on my 1956 261 engine and it is a wise move. Works great on my 261 and as he mentioned, water pumps are available from your local parts house. Works great.
Dave, thanks for your work on this.

...and drilling the hole was no problem.

Last edited by Achipmunk; Mon Feb 03 2020 06:14 PM.

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Re: Water Pump Relocation Adapter
Pre '68 Dave #1344848 Mon Feb 03 2020 06:42 PM
Joined: Sep 2001
Posts: 30,310
ace skiver
It looks like someone has copied Dave’s invention, and is listing it for sale on eBay.

Dave’s plate has a lower total cost, after adding shipping cost.

Support the inventor - Pre ‘68 Dave.

I have installed Dave’s plates on three 1955-2nd and newer 235/261 engines. This is an invaluable conversion for using a high-pressure 235/261 on/in a 1955-2nd or earlier Chevrolet truck.

Tim []
1954 3106 Carryall Suburban [] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. []
Re: Water Pump Relocation Adapter
Pre '68 Dave #1344859 Mon Feb 03 2020 09:45 PM
Joined: Sep 2009
Posts: 302
Shop Shark
I used it on my 261, worked perfectly.

1953 Chevrolet 3100
261 / 4-speed / 4:11 / Commercial Red

Re: Water Pump Relocation Adapter
Pre '68 Dave #1344881 Tue Feb 04 2020 12:25 AM
Joined: Jan 2018
Posts: 334
Shop Shark
I also used it on my 37 with a 57 235. Worked great and Dave was a great help with questions. Thanks Dave

Re: Water Pump Relocation Adapter
Pre '68 Dave #1344883 Tue Feb 04 2020 12:35 AM
Joined: Feb 2019
Posts: 783
Jack of all Trades, Master of None
I also used Pre ‘68 Dave’s plate and it works great. I also want to support the inventor, who is one of us bolters. Dave sells it off of eBay look so for “pre68dave” as the eBay sellers name.

Last edited by Phak1; Tue Feb 04 2020 12:36 AM.


1952 Chevrolet 3100
Project Journals
‘59 235 & hydraulic lifters
“Three on the Tree” & 4:11 torque tube
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Re: Water Pump Relocation Adapter
Pre '68 Dave #1345852 Mon Feb 10 2020 05:47 PM
Joined: Aug 2017
Posts: 467
Shop Shark
Used on my 1959 chevy 235. Easy to install. Dave also answered questions before I did the adapter!! Support one of our Own..

Re: Water Pump Relocation Adapter
Pre '68 Dave #1346366 Thu Feb 13 2020 04:39 PM
Joined: Feb 2004
Posts: 20,833
The pressed-on cast iron pulley on that 216 style water pump can be modified by machining it to accept a 2-sheave stamped steel pulley for a small block Ford V8. With a 2-groove harmonic balancer from a 250 inline six adapted to the earlier engine, that allows for some creative belt routing for air conditioning, power steering, etc.

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